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Methyl ethyl ketone preparation method

A technology of methyl ethyl ketone and sec-butyl acetate, which is applied in the field of preparation of methyl ethyl ketone, can solve the problems of low conversion rate of raw materials and high energy consumption, and achieve the effect of high conversion rate of raw materials, low energy consumption and easy availability of raw materials

Inactive Publication Date: 2013-03-27
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method for preparing sec-butanol by hydration of n-butene is mainly divided into indirect hydration method using sulfuric acid as catalyst, and direct hydration method using ion exchange resin or heteropoly acid as catalyst. However, these two methods for preparing sec-butanol Both methods have the disadvantages of low conversion rate of raw materials and high energy consumption.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0010] The preparation method according to the methyl ethyl ketone of the present invention comprises the following steps:

[0011] (1) In the presence of a transesterification catalyst, adding sec-butyl acetate and lower alcohols to a catalytic rectification tower for transesterification, wherein the lower alcohols are C1-C3 alcohols;

[0012] (2) In the presence of a dehydrogenation catalyst, dehydrogenation is carried out with the sec-butanol separated from the tower bottom liquid obtained in step (1) or the separated sec-butanol from the tower bottom liquid obtained in step (1).

[0013] According to the described method of the present invention, in step (1), in order to further improve the transformation efficiency of sec-butyl acetate and sec-butanol selectivity, the operating process of described transesterification reaction preferably comprises: The mixture of sec-butyl acetate, lower alcohol and transesterification catalyst is heated to boiling, and reacts to the azeo...

Embodiment 1

[0030] This example is used to illustrate the preparation method of the methyl ethyl ketone of the present invention.

[0031] (1) Preparation of sec-butanol

[0032] Add sec-butyl acetate and ethanol to the catalytic rectification column (the number of trays is 50) with molar ratio as 1:4, with respect to the add-on amount of sec-butyl acetate of 100 parts by weight, add 2 parts by weight therein CaO is used as a catalyst. Under normal pressure, the material in the catalytic rectification tower is fully refluxed under heating. After the top temperature reaches 72°C (the azeotropic point of ethanol and ethyl acetate), the extraction begins, and the reflux ratio is controlled. The ratio is 3:1, so that the azeotrope of ethanol and ethyl acetate is distilled from the top of the tower; when the temperature of the top of the tower rises to 78°C (the boiling point of ethanol), the bottom liquid of the tower is distilled and separated to collect sec-butanol.

[0033] It is known by...

Embodiment 2

[0040] This example is used to illustrate the preparation method of the methyl ethyl ketone of the present invention.

[0041] Methyl ethyl ketone was prepared according to the method of Example 1, except that in step (2), a ZSM-5 molecular sieve catalyst (molar ratio of silicon to aluminum was 38) was used instead of the zinc-copper alloy catalyst as the dehydrogenation catalyst.

[0042] It is known by calculation that the conversion rate of sec-butanol is 75%, and the selectivity of methyl ethyl ketone is 78%.

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PUM

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Abstract

The invention relates to a methyl ethyl ketone preparation method. The method comprises the following steps: 1, carrying out an ester exchange reaction of sec-butyl acetate and low carbon alcohol in a catalytic rectifying tower in the presence of an ester exchange catalyst, wherein the low carbon alcohol is C1-C3 alcohol; and 2, carrying out a dehydrogenation reaction of the tower bottoms obtained in step 1 or sec-butyl alcohol separated from the tower bottoms obtained in the step 1 in the presence of a dehydrogenation catalyst. The method which allows sec-butyl alcohol to be prepared through using the sec-butyl acetate and the low carbon alcohol has the advantages of high raw material conversion rate and high sec-butyl alcohol selectivity.

Description

technical field [0001] The invention relates to a method for preparing methyl ethyl ketone. Background technique [0002] Methyl ethyl ketone, also known as 2-butanone, is an important low-boiling point solvent that can form azeotropes with many solvents. It has strong solubility for synthetic rubber, fiber derivatives, oils, etc., and is widely used in coatings, adhesives, etc. Agents, lubricating oils, dyes and printing inks and other fields. At the same time, it can also produce methyl ethyl ketone peroxide, methyl ethyl ketone oxime and other intermediates for preparing fragrances, antioxidants and certain catalysts. [0003] The production methods of methyl ethyl ketone include n-butene method, butane liquid phase oxidation method, isobutylbenzene method, isobutene oxidation method, butadiene catalytic hydrolysis method, mixed C4 hydrocarbon oxidation method, fermentation method and so on. The industrial production methods are mainly n-butene method, butane liquid pha...

Claims

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Application Information

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IPC IPC(8): C07C49/10C07C45/00C07C31/12C07C29/128
Inventor 衷晟黄华廖小元徐斌佘喜春谢琼玉
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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